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[单选题]
根据《建筑施工高处作业安全技术规范》(JGJ80-2016),临边作业是指在工作面边沿无围护或围护设施高度低于()的高处作业,包括楼板边、楼梯段边、屋面边、阳台边、各类坑、沟、槽等边沿的高处作业。
A.600mm
B.800mm
C.1000mm
D.1200mm
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A.600mm
B.800mm
C.1000mm
D.1200mm
A.1
B.2
C.3
D.4
A.5.50kN/m2
B. 6.50kN/m2
C.7.50kN/m2
D. 8.50kN/m2
A.600
B.700
C.800
D.900
A.55
B.65
C.66